Magnetic separation of iron and heavy metals from water

A magnetic separation device is being developed for removal of iron and heavy metals from water. The device consists of a column of supported magnetite surrounded by a movable permanent magnet. The mineral magnetite, or synthetically prepared iron ferrite (FeO.Fe2O3), is typically supported on various materials to permit adequate water passage through the column. In the presence of an external magnetic field, enhanced capacity was observed in using supported magnetite for removal of actinides and heavy metals from wastewater. The enhanced capacity is primarily due to magnetic filtration of colloidal and nanoscale particles along with some complex and ion exchange sorption mechanisms. This paper will review some previous work on the use of magnetite for wastewater treatment and discuss the development and potential of the magnetic nanoscale filtration/sorption process for water treatment. Recent research results are also presented on preliminary experimental studies using the process with water samples containing iron.

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Applications of Bentonite to Soil Decontamination

Revista de Chimie ◽

10.37358/rc.18.7.6397 ◽

2018 ◽

Vol 69 (7) ◽

pp. 1695-1698

Author(s):

Marin Rusanescu ◽

Carmen Otilia Rusanescu ◽

Gheorghe Voicu ◽

Mihaela Begea

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Laboratory Experiments ◽

Experimental Studies ◽

Heavy Metal Concentration ◽

Polluted Soil ◽

Raw Material ◽

Soil Decontamination ◽

Metal Retention ◽

Removal Of Heavy Metals

A calcium bentonite from Orasu Nou deposit (Satu Mare Romania) was used as raw material. We have conducted laboratory experiments to determine the influence of bentonite on the degree of heavy metal retention. It has been observed that the rate of retention increases as the heavy metal concentration decreases. Experimental studies have been carried out on metal retention ( Zn) in bentonite. In this paper, we realized laboratory experiments for determining the influence of metal (Zn) on the growth and development of two types of plants (Pelargonium domesticum and Kalanchoe) and the effect of bentonite on the absorption of pollutants. These flowers were planted in unpolluted soil, in heavy metal polluted soil and in heavy metal polluted soil to which bentonite was added to observe the positive effect of bentonite. It has been noticed that the flowers planted in unpolluted soil and polluted with heavy metals to which bentonite has been added, the flowers have flourished, the leaves are still green and the plants whose soils have been polluted with heavy metals began to dry after 6 days, three weeks have yellowish leaves and flowers have dried. Experiments have demonstrated the essential role of bentonite for the removal of heavy metals polluted soil.

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Experimental Studies on a Mineral Containing Titanium in Baoding Area

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.826.34 ◽

2013 ◽

Vol 826 ◽

pp. 34-37 ◽

Cited By ~ 1

Author(s):

Guo Zhen Liu ◽

Shu Juan Dai ◽

Li Mei Bai ◽

Yu Xin Ma ◽

Yong Zhang

Keyword(s):

Magnetic Separation ◽

High Intensity ◽

Ph Value ◽

Experimental Studies ◽

Mineral Processing ◽

Shaking Table ◽

Gravity Concentration

The main elements can be recovered for mineral processing in a mineral containing titanium of Baoding area were Ti, Fe and V, and the elements in the main gangue minerals were Si and Al. Gravity concentration, gravity concentration-high intensity magnetic separation and gravity concentration-flotation tests were performed on the ore sample respectively. The results showed that, in the test of shaking table, when the grinding fineness was -0.074mm 93%, the productivity of concentrate can reach 32.24%; when grinding fineness was -0.074mm 93%, after gravity concentration-magnetic separation, 30.25% of concentrate productivity can be attained; when the grinding fineness was -0.074mm 85%, after gravity concentration-flotation, the productivity of concentrate was 3.31%. Maybe it's the condition of the tests wasn't controlled well, especially adjusting pH value in the flotation stage, it's hard to control, so the results were not very good.

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4710472 Magnetic separation device

Biotechnology Advances ◽

10.1016/0734-9750(88)90108-5 ◽

1988 ◽

Vol 6 (2) ◽

pp. 243

Keyword(s):

Magnetic Separation ◽

Separation Device

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Melting Point of Carbon Particles behind the Gas Detonation Front

Siberian Journal of Physics ◽

10.25205/2541-9447-2021-16-2-59-70 ◽

2022 ◽

Vol 16 (2) ◽

pp. 59-70

Author(s):

E. S. Prokhorov

Keyword(s):

Melting Point ◽

Detonation Front ◽

Molar Fraction ◽

Experimental Studies ◽

Oxygen Mixture ◽

Detonation Products ◽

Gas Detonation ◽

Nanoscale Particles ◽

Carbon Particles ◽

Carbon Condensate

A mathematical model of gas detonation of fuel-enriched mixtures of hydrocarbons with oxygen has been formulated, which makes it possible to numerically study the equilibrium flows of detonation products in the presence of free carbon condensation. Reference data for graphite were used to describe the thermodynamic properties of carbon condensate. The calculations are compared with the known results of experimental studies in which, when detonating an acetylene-oxygen mixture in a pipe closed at one end, it is possible to obtain nanoscale particles from a carbon material with special properties. It is assumed that the melting point of such a material is lower than that of graphite and is about 3100 K. Only with such an adjustment of the melting temperature, the best agreement (with an accuracy of about 3 %) was obtained between the calculated and experimental dependence of the detonation front velocity on the molar fraction of acetylene in the mixture.

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RESEARCH OF HEAVY METAL SUPPLY IN AGROLANDSCAPE DURING THE VEGETATION PERIOD

EurasianUnionScientists ◽

10.31618/esu.2413-9335.2021.7.89.1443 ◽

2021 ◽

pp. 4-8

Author(s):

A. Ilinskiy

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Agricultural Landscape ◽

Experimental Studies ◽

Growing Season ◽

Vegetation Period ◽

Mineral Fertilizers

The paper presents the results of a study of the intake of heavy metals into the agricultural landscape during the growing season. In the article of the parish, their intake with mineral fertilizers, seeds, precipitation was taken into account. Studies have shown that precipitation is the most significant input of the studied heavy metals into the agricultural landscape. Depending on the variant of the experiment, their input with precipitation varies as follows: for copper 77.5 - 95.9%; for zinc 50.5 - 82.0%; for lead 49.3 - 89.4%; for cadmium 68.4 - 94.7%. Based on the results of experimental studies, an empirical series of pollutants entering the agricultural landscape was built: Zn  Cu  Pb Cd.

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Experimental studies in magnetic separation of ultrafine hematite

IEEE Transactions on Magnetics ◽

10.1109/20.92126 ◽

1988 ◽

Vol 24 (6) ◽

pp. 2413-2415 ◽

Cited By ~ 3

Author(s):

M.F. Haque ◽

S. Arajs ◽

C. Moyer

Keyword(s):

Magnetic Separation ◽

Experimental Studies

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Mathematical Modelling for Copper and Lead Adsorption on Coffee Grounds

Proccedings of 10th International Conference "Environmental Engineering" ◽

10.3846/enviro.2017.007 ◽

2017 ◽

Author(s):

Jurgita Seniūnaitė ◽

Rasa Vaiškūnaitė ◽

Kristina Bazienė

Keyword(s):

Heavy Metals ◽

Mathematical Modelling ◽

Adsorption Kinetics ◽

Adsorption Process ◽

Freundlich Isotherm ◽

Sorption Process ◽

Second Order ◽

Order Kinetic ◽

Coffee Grounds ◽

Pseudo Second Order

Research studies on the adsorption kinetics are conducted in order to determine the absorption time of heavy metals on coffee grounds from liquid. The models of adsorption kinetics and adsorption diffusion are based on mathe-matical models (Cho et al. 2005). The adsorption kinetics can provide information on the mechanisms occurring be-tween adsorbates and adsorbents and give an understanding of the adsorption process. In the mathematical modelling of processes, Lagergren’s pseudo-first- and pseudo-second-order kinetics and the intra-particle diffusion models are usually applied. The mathematical modelling has shown that the kinetics of the adsorption process of heavy metals (copper (Cu) and lead (Pb)) is more appropriately described by the Lagergren’s pseudo-second-order kinetic model. The kinetic constants (k2Cu = 0.117; k2Pb = 0,037 min−1) and the sorption process speed (k2qeCu = 0.0058–0.4975; k2qePb = 0.021–0.1661 mg/g per min) were calculated. After completing the mathematical modelling it was calculated that the Langmuir isotherm better reflects the sorption processes of copper (Cu) (R2 = 0.950), whilst the Freundlich isotherm – the sorption processes of lead (Pb) (R2 = 0.925). The difference between the mathematically modelled and experimen-tally obtained sorption capacities for removal of heavy metals on coffee grounds from aqueous solutions is 0.059–0.164 mg/l for copper and 0.004–0.285 mg/l for lead. Residual concentrations of metals in a solution showed difference of 1.01 and 0.96 mg/l, respectively.

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